| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.appsecurity.cts; |
| |
| /** |
| * Utilities to deal with exceptions |
| */ |
| public class ExceptionUtils { |
| private ExceptionUtils() {} |
| |
| /** |
| * Gets the root {@link Throwable#getCause() cause} of {@code t} |
| */ |
| public static Throwable getRootCause(Throwable t) { |
| while (t.getCause() != null) t = t.getCause(); |
| return t; |
| } |
| |
| /** |
| * Appends {@code cause} at the end of the causal chain of {@code t} |
| * |
| * @return {@code t} for convenience |
| */ |
| public static <E extends Throwable> E appendCause(E t, Throwable cause) { |
| if (cause != null) { |
| getRootCause(t).initCause(cause); |
| } |
| return t; |
| } |
| } |